Question

write the step to starting of desktop computer

Answer 1

first switch on the main switch.
thn switch on the ups.
thn switch on the cpu and thn press the button present in the monitor

Answer 2

1. When you push the power switch, it tells the computer to turn on the power
2.  When the power is turned on, the first thing the computer does is loads  a simple program from a chip inside the computer called the BIOS
3.  This is all the text (or boot logo on modern computers) that you see  when the computer turns on, it tells the computer how to find  Windows/MacOS/Linux that is stored on the hard drives
4. Windows/MacOS/Linux gets loaded from the hard drives